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Old 03-22-2011, 07:18 AM   #1
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problem on cdev structure

In the file include/linux/cdev.h at the kernel source tree we can find the definition of the structure cdev
 13 struct cdev {
 14     struct kobject kobj;
 15     struct module *owner;
 16     const struct file_operations *ops;
 17     struct list_head list;
 18     dev_t dev;
 19     unsigned int count;
 20 };
Above, the filed
dev_t dev - Initial major and minor numbers assigned to the device driver, We can use the macro MAJOR(dev) and MINOR(dev) to get the major and the minor number respectively.
unsigned int count - Size of the range of device numbers assigned to the device driver
But here I'm confused with the count filed, it standard for the minor or the major numbers?
Old 04-19-2011, 04:38 PM   #2
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